2105198980123 has 2 divisors, whose sum is σ = 2105198980124. Its totient is φ = 2105198980122.

The previous prime is 2105198980117. The next prime is 2105198980187. The reversal of 2105198980123 is 3210898915012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105198980123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105198930123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052599490061 + 1052599490062.

It is an arithmetic number, because the mean of its divisors is an integer number (1052599490062).

Almost surely, 2^{2105198980123} is an apocalyptic number.

2105198980123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105198980123 is an equidigital number, since it uses as much as digits as its factorization.

2105198980123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 2105198980123 in words is "two trillion, one hundred five billion, one hundred ninety-eight million, nine hundred eighty thousand, one hundred twenty-three".